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Q27.4 ICD-10-CM Code: Congenital phlebectasia

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
5 Excludes2

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 299 — PERIPHERAL VASCULAR DISORDERS WITH MCC (MDC 05)
  • MS-DRG 300 — PERIPHERAL VASCULAR DISORDERS WITH CC (MDC 05)
  • MS-DRG 301 — PERIPHERAL VASCULAR DISORDERS WITHOUT CC/MCC (MDC 05)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for Q27.4 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on Q27.4 itself; “inherited from” names the category or block whose note applies here.

Excludes2 — Not Included Here

Conditions not covered by this code, but which may be reported alongside it when both are present.

Source: inherited from Q27

Coder workflow for Q27.4

MedCoder structured workflow — derived from this code’s own official record

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

Official instructions as workflow

  • Excludes2 — not part of Q27.4(5 notes)

    Coding workflow: The conditions named in this note are not included in Q27.4. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

    CompareQ24.5, Q14.1, D18

    See the official tabular notes · Guidelines I.A.12.b

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse Q27.4 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of Q27.4 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • Q27.9— Specificity relationship (Review)

    Overlapping diagnoses in the same category.

    Overlapping codes in the same category — the documentation decides which is the more specific fit.

    What moves you there: A record that documents no more than “Congenital malformation of peripheral vascular system, unspecified” takes Q27.9; specificity in the record moves it back here.

    Full comparison: Q27.4 vs Q27.9 →

  • Q28.0— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of anomalies of cerebral and precerebral vessels adds Q28.0; it is not part of this code and both may be reported when both are documented.

    Full comparison: Q27.4 vs Q28.0 →

  • Q28.3— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of anomalies of cerebral and precerebral vessels adds Q28.3; it is not part of this code and both may be reported when both are documented.

    Full comparison: Q27.4 vs Q28.3 →

  • Q24.5— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of anomalies of coronary vessels adds Q24.5; it is not part of this code and both may be reported when both are documented.

    Full comparison: Q27.4 vs Q24.5 →

  • Q25.5— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of anomalies of pulmonary artery adds Q25.5; it is not part of this code and both may be reported when both are documented.

    Full comparison: Q27.4 vs Q25.5 →

  • Q25.7— Excludes2 relationship (Informational)

    Distinct conditions — both may be reported.

    A distinct condition — both may be reported when both are documented.

    What moves you there: Documentation of anomalies of pulmonary artery adds Q25.7; it is not part of this code and both may be reported when both are documented.

    Full comparison: Q27.4 vs Q25.7 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Code Overview

Congenital phlebectasia is a billable ICD-10-CM diagnosis code (Q27.4).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Indexed Clinical Terms (1)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Verify Before Coding

  • CC as a secondary diagnosis (FY2027). Can raise the stay's MS-DRG severity tier.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name Q27.4 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Excludes2 note: P29 — Cardiovascular disorders originating in the perinatal period (via Q27.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 2 Code Also instructions across 2 chapters: I27.21 — Secondary pulmonary arterial hypertension (via Q27.-), Z71.87 — Encounter for pediatric-to-adult transition counseling (via Q27.-).

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: CC — Complication or Comorbidity. Reported as a secondary diagnosis, this code raises the stay's MS-DRG severity tier — except when the principal diagnosis is one of 30 clinically related codes on its CMS exclusion list.

Named in the grouper logic of 3 MS-DRGs: DRG 299 (MDC 05), DRG 300 (MDC 05), DRG 301 (MDC 05).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):MAL001 — Cardiac and circulatory congenital anomalies (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical process (MS-DRG)

Acts as CC — raises the severity of other admissions. CMS groups these diagnoses into one MS-DRG principal-diagnosis exclusion process — a CC/MCC on this list never raises severity when the principal diagnosis is also on it.

Q21.10 — Atrial septal defect, unspecified, Q21.11 — Secundum atrial septal defect, Q21.12 — Patent foramen ovale, Q21.13 — Coronary sinus atrial septal defect, Q21.14 — Superior sinus venosus atrial septal defect, Q21.15 — Inferior sinus venosus atrial septal defect, Q21.16 — Sinus venosus atrial septal defect, unspecified, Q21.19 — Other specified atrial septal defect, Q21.20 — Atrioventricular septal defect, unspecified as to partial or complete, Q21.21 — Partial atrioventricular septal defect, Q21.22 — Transitional atrioventricular septal defect, Q21.23 — Complete atrioventricular septal defect, Q21.3 — Tetralogy of Fallot, Q21.4 — Aortopulmonary septal defect, Q21.8 — Other congenital malformations of cardiac septa, Q21.9 — Congenital malformation of cardiac septum, unspecified, Q27.30 — Arteriovenous malformation, site unspecified, Q28.0 — Arteriovenous malformation of precerebral vessels, Q28.1 — Other malformations of precerebral vessels, Q28.8 — Other specified congenital malformations of circulatory system, +9 more

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Cardiac and circulatory congenital anomalies).

Q26.6 — Portal vein-hepatic artery fistula, Q26.8 — Other congenital malformations of great veins, Q26.9 — Congenital malformation of great vein, unspecified, Q27.0 — Congenital absence and hypoplasia of umbilical artery, Q27.1 — Congenital renal artery stenosis, Q27.2 — Other congenital malformations of renal artery, Q27.30 — Arteriovenous malformation, site unspecified, Q27.31 — Arteriovenous malformation of vessel of upper limb, Q27.32 — Arteriovenous malformation of vessel of lower limb, Q27.33 — Arteriovenous malformation of digestive system vessel, Q27.34 — Arteriovenous malformation of renal vessel, Q27.39 — Arteriovenous malformation, other site, Q27.8 — Other specified congenital malformations of peripheral vascular system, Q27.9 — Congenital malformation of peripheral vascular system, unspecified, Q28.0 — Arteriovenous malformation of precerebral vessels, Q28.1 — Other malformations of precerebral vessels, Q28.2 — Arteriovenous malformation of cerebral vessels, Q28.3 — Other malformations of cerebral vessels, Q28.8 — Other specified congenital malformations of circulatory system, Q28.9 — Congenital malformation of circulatory system, unspecified, +87 more

Contextual Map

Every relationship of Q27.4 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run Q27.4 with these 3 related codes in Claim Check

Hierarchy

Referenced by Excludes2 notes

Referenced by Code Also instructions

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 05 — Diseases and Disorders of the Circulatory System[MDC crossing]: “Diseases and Disorders of the Circulatory System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 15,708 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Phlebectasia, congenital[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes (13)

Change history

  • FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder structured relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "Q27.4 — Congenital phlebectasia." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/q27.4-congenital-phlebectasia

Change history

  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Congenital phlebectasia

No changes since FY2016 — additions, deletions, description changes and billable-status changes are tracked through FY2027, and none are recorded for this code. Note changes are tracked from FY2027 only.

Nearest Codes in This Family

Official ICD-10-CM classifications closest to Q27.4 in its code family, with their registry titles.

View all codes in the Q27 family